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Wednesday, 12 December 2018
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Raw materials & technologies, Technologies

UV irradiation grafting of acrylamide onto dopamine-modified 316L stainless steel

Tuesday, 13 November 2018

The UV irradiation grafting technique was applied to a modified 316L stainless steel surface (SS) in a new study to improve corrosion resistance.

Results showed that acrylamide was successfully grafted onto the poly-dopamine-coated 316L stainless steel surface (SS). Source: artbaggage / Pixabay.

Results showed that acrylamide was successfully grafted onto the poly-dopamine-coated 316L stainless steel surface (SS). Source: artbaggage / Pixabay.

The SS sheets were first coated with dopamine by dipping in the dopamine solution with KIO3 and ultrasonication. Then, the acrylamide (AAm) was grafted onto the dopamine-modified SS samples under UV irradiation with ultrasonication, when the ketone-diol compound was used as a photoinitiating system. For comparison, the UV irradiation grafting of AAm was also performed without ultrasonication. The structures and morphologies of the samples were examined by Fourier transform IR spectroscopy, atomic force microscopy, and scanning electronic microscopy before and after modification, respectively.

Improved hydrophilicity and corrosion resistance

Results showed that acrylamide was successfully grafted onto the poly-dopamine-coated SS. The hydrophilicity of the modified samples improved significantly, determined by the water contact angle measurement. Shown by Tafel polarisation curves, the corrosion potential of modified SS was positively shifted, which demonstrated that the corrosion resistance was improved.

The study is published in: Journal of Coatings Technology and Research  September 2018, Volume 15, Issue 5, pp 1181–1189.

Image source: Pixabay

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